Hi,
I’m new to flowable so I have question, can we use flowable cloud designer with OSS?
Especially flowable v7.0.M1?
Since flowable v7 OSS doesnt come with designer, Im asking this question.
Yes you can, it is currently available for free. 
I tried to import app from cloud to local(floable-ui(v6.8)) and it was throwing error. I guess format got changed or not supporting backward.
Note: In Cloud we can create channels which was not the case in local-setup(v6.8)